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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The behaviour for numbers exactly between two multiples of 5 still isn't correctly specified.
This part of the requirements made me think that rounding down to zero shouldn't happen. The tests made this more clear, but I thought I would point this out.